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rr lyrae variables

Symposium - International Astronomical Union (1)

International Astronomical Union (1)

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The Ages of the Globular Clusters
Bruce W. Carney
Journal:

Symposium - International Astronomical Union / Volume 149 / 1992

Published online by Cambridge University Press:

07 August 2017, pp. 15-21

Print publication:

1992
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The recent results for the relation between M V and [Fe/H] for RR Lyrae variables and horizontal branch stars are reviewed: < M V(RR) > = 0.15[Fe/H] + 1.08. If [O/Fe] = 0.3, the oldest clusters' ages approach 20 Gyrs, and the the most metal-poor clusters are older than the most metal-rich by several Gyrs. If [O/Fe] ≃ −0.4[Fe/H], the most metal-poor clusters have ages of about 14 Gyrs and the most metal-rich clusters are not much younger. In both cases, there are age spreads among the intermediate metallicity clusters of up to 6 Gyrs.